<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>

    <input type="text" class="username">
    <br>
    <input type="text" class="password">
    <br>
    <input type="button" value="注册" class="btn">

    <script src="./js/reg.js" type="module"></script>
    
</body>
</html>